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President Barack Obama laughs as British Prime Minister David Cameron makes opening remarks during their joint news conference in the Rose Garden of the White House in Washington, Wednesday, March 14, 2012. (AP Photo/Charles Dharapak)

President Barack Obama laughs as British Prime Minister David Cameron makes opening remarks during their joint news conference in the Rose Garden of the White House in Washington, Wednesday, March 14, 2012. (AP Photo/Charles Dharapak)